INBX · Inhibrx Biosciences, Inc.

This stock option will be fully exercisable on June 3, 2027, subject to the reporting person's continued service through such date.

This stock option will be fully exercisable on June 3, 2027, subject to the reporting person's continued service through such date.

This stock option will be fully exercisable on June 3, 2027, subject to the reporting person's continued service through such date.

This stock option will be fully exercisable on June 3, 2027, subject to the reporting person's continued service through such date.

Twenty-five percent (25%) of the total shares subject to the stock option become exercisable on April 24, 2027, with the balance to vest and become exercisable in equal successive monthly installments for thirty-six (36) months thereafter, subject to the Reporting Person's continuous service to the Issuer through each vesting date.

Andreas Halvorsen, David C. Ott and Rose S. Shabet are Executive Committee members of certain management entities, including Viking Global Partners LLC, the general partner of Viking Global Investors LP ("VGI"), and Viking Global Opportunities Parent GP LLC ("Opportunities Parent"), the sole member of Viking Global Opportunities GP LLC ("Opportunities GP"), the sole member of Viking Global Opportunities Portfolio GP LLC ("Opportunities Portfolio GP"), the general partner of Viking Global Opportunities Illiquid Investments Sub-Master LP ("Opportunities Fund"). Opportunities Parent is also the sole member of Viking Global Opportunities Drawdown GP LLC ("VGOD GP"), the sole member of Viking Global Opportunities Drawdown Portfolio GP LLC ("VGOD Portfolio GP"), the general partner of Viking Global Opportunities Drawdown (Aggregator) LP ("VGOD").

VGI provides managerial services to various investment funds and vehicles, including Opportunities Fund, VGOD, and KAVRA 104 LLC ("KAVRA 104"). VGI, Opportunities Parent, Opportunities GP, Opportunities Portfolio GP, Opportunities Fund, Mr. Halvorsen, Mr. Ott and Ms. Shabet are, collectively, the "Reporting Persons." Each of VGI, Mr. Halvorsen, Mr. Ott and Ms. Shabet may be deemed to beneficially own all of the securities reported on this form.

These shares of Common Stock are held directly by KAVRA 104. The membership interests of KAVRA 104 are held by Viking Global Opportunities LP and Viking Global Opportunities Intermediate LP. Opportunities GP is the general partner of Viking Global Opportunities LP and Viking Global Opportunities Intermediate LP. Because of the relationship between Opportunities GP, Opportunities Parent and KAVRA 104, each of Opportunities GP and Opportunities Parent may be deemed to beneficially own the shares of Common Stock held directly by KAVRA 104.

The Reporting Persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose.

Andreas Halvorsen, David C. Ott and Rose S. Shabet are Executive Committee members of certain management entities, including Viking Global Partners LLC, the general partner of Viking Global Investors LP ("VGI"), and Viking Global Opportunities Parent GP LLC ("Opportunities Parent"), the sole member of Viking Global Opportunities GP LLC ("Opportunities GP"), the sole member of Viking Global Opportunities Portfolio GP LLC ("Opportunities Portfolio GP"), the general partner of Viking Global Opportunities Illiquid Investments Sub-Master LP ("Opportunities Fund"). Opportunities Parent is also the sole member of Viking Global Opportunities Drawdown GP LLC ("VGOD GP"), the sole member of Viking Global Opportunities Drawdown Portfolio GP LLC ("VGOD Portfolio GP"), the general partner of Viking Global Opportunities Drawdown (Aggregator) LP ("VGOD").

VGI provides managerial services to various investment funds and vehicles, including Opportunities Fund, VGOD, and KAVRA 104 LLC ("KAVRA 104"). VGI, Opportunities Parent, Opportunities GP, Opportunities Portfolio GP, Opportunities Fund, Mr. Halvorsen, Mr. Ott and Ms. Shabet are, collectively, the "Reporting Persons." Each of VGI, Mr. Halvorsen, Mr. Ott and Ms. Shabet may be deemed to beneficially own all of the securities reported on this form.

These shares of Common Stock are held directly by VGOD. Because of the relationship between Opportunities Parent and VGOD, Opportunities Parent may be deemed to beneficially own the shares of Common Stock held directly by VGOD.

The Reporting Persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose.

Andreas Halvorsen, David C. Ott and Rose S. Shabet are Executive Committee members of certain management entities, including Viking Global Partners LLC, the general partner of Viking Global Investors LP ("VGI"), and Viking Global Opportunities Parent GP LLC ("Opportunities Parent"), the sole member of Viking Global Opportunities GP LLC ("Opportunities GP"), the sole member of Viking Global Opportunities Portfolio GP LLC ("Opportunities Portfolio GP"), the general partner of Viking Global Opportunities Illiquid Investments Sub-Master LP ("Opportunities Fund"). Opportunities Parent is also the sole member of Viking Global Opportunities Drawdown GP LLC ("VGOD GP"), the sole member of Viking Global Opportunities Drawdown Portfolio GP LLC ("VGOD Portfolio GP"), the general partner of Viking Global Opportunities Drawdown (Aggregator) LP ("VGOD").

VGI provides managerial services to various investment funds and vehicles, including Opportunities Fund, VGOD, and KAVRA 104 LLC ("KAVRA 104"). VGI, Opportunities Parent, Opportunities GP, Opportunities Portfolio GP, Opportunities Fund, Mr. Halvorsen, Mr. Ott and Ms. Shabet are, collectively, the "Reporting Persons." Each of VGI, Mr. Halvorsen, Mr. Ott and Ms. Shabet may be deemed to beneficially own all of the securities reported on this form.

These shares of Common Stock are held directly by Opportunities Fund. Because of the relationship between Opportunities Portfolio GP, Opportunities GP, Opportunities Parent and Opportunities Fund, each of Opportunities Portfolio GP, Opportunities GP and Opportunities Parent may be deemed to beneficially own the securities held directly by Opportunities Fund.

The Reporting Persons disclaim beneficial ownership of these securities except to the extent of their pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose.

This stock option will be fully exercisable on May 28, 2026, subject to the reporting person's continued service through such date.

This stock option will be fully exercisable on May 28, 2026, subject to the reporting person's continued service through such date.

This stock option will be fully exercisable on May 28, 2026, subject to the reporting person's continued service through such date.

This stock option will be fully exercisable on May 28, 2026, subject to the reporting person's continued service through such date.

Twenty-five percent (25%) of the total shares subject to this stock option will become exercisable on April 1, 2026, with the balance to vest and become exercisable in equal successive monthly installments for thirty-six (36) months thereafter, subject to the Reporting Person's continuous service to the Issuer through each vesting date.

Twenty-five percent (25%) of the total shares subject to this stock option will become exercisable on April 1, 2026, with the balance to vest and become exercisable in equal successive monthly installments for thirty-six (36) months thereafter, subject to the Reporting Person's continuous service to the Issuer through each vesting date.

This transaction involved a gift of 90,000 shares of Common Stock by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to the reporting person's adult children not residing in the reporting person's household, and to which the reporting person does not have a beneficial interest.

These securities are directly owned by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust. Jon Faiz Kayyem is the trustee of The Jon Faiz Kayyem and Paige N. Gates Family Trust and he disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

Reflects the transfer for no consideration of shares of Common Stock from The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to the Jon Faiz Kayyem Revocable Trust and the Paige-Gates Kayyem Revocable Trust.

These securities are directly owned by the Jon Faiz Kayyem Revocable Trust, of which Jon Faiz Kayyem is the trustee.

Reflects the transfer for no consideration of shares of Common Stock from The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to the Jon Faiz Kayyem Revocable Trust and the Paige-Gates Kayyem Revocable Trust.

These securities are directly owned by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust. Jon Faiz Kayyem is the trustee of The Jon Faiz Kayyem and Paige N. Gates Family Trust and he disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

Reflects the transfer for no consideration of shares of Common Stock from The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to the Jon Faiz Kayyem Revocable Trust and the Paige-Gates Kayyem Revocable Trust.

These securities are directly owned by the Paige-Gates Kayyem Revocable Trust, of which Jon Faiz Kayyem's spouse is the trustee.

This transaction involved a gift of 52,000 shares of Common Stock by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to the reporting person's adult children not residing in the reporting person's household, and to which the reporting person does not have a beneficial interest.

These securities are directly owned by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust. Jon Faiz Kayyem is the trustee of The Jon Faiz Kayyem and Paige N. Gates Family Trust and he disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

The shares were purchased in multiple transactions at prices ranging from $13.93 to $14.25, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child B. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

The shares were purchased in multiple transactions at prices ranging from $13.93 to $14.25, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child A. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

The shares were purchased in multiple transactions at prices ranging from $14.09 to $14.25, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child A. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

The shares were purchased in multiple transactions at prices ranging from $14.09 to $14.25, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child B. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

The shares were purchased in multiple transactions at prices ranging from $16.70 to $17.695, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust.

The shares were purchased in multiple transactions at prices ranging from $15.00 to $15.10, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust.

The shares were purchased in multiple transactions at prices ranging from $15.00 to $15.08, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The shares were purchased in multiple transactions at prices ranging from $15.01 to $15.26, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust.

The shares were purchased in multiple transactions at prices ranging from $15.08 to $15.50, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust.

The shares were purchased in multiple transactions at prices ranging from $15.04 to $15.70, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by the Lappe Family Trust. Mark P. Lappe is a trustee of the Lappe Family Trust and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Lappe Family Trust.

The shares were purchased in multiple transactions at prices ranging from $16.115 to $16.465, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a trust, for the benefit of the reporting person's immediate family. Mark P. Lappe, as an immediate family member of the beneficiaries of the trust, may be deemed to indirectly beneficially own the securities owned by the trust.

The shares were purchased in multiple transactions at prices ranging from $15.115 to $16.11, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a trust, for the benefit of the reporting person's immediate family. Mark P. Lappe, as an immediate family member of the beneficiaries of the trust, may be deemed to indirectly beneficially own the securities owned by the trust.

The shares were purchased in multiple transactions at prices ranging from $13.96 to $14.13, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a trust, for the benefit of the reporting person's immediate family. Mark P. Lappe, as an immediate family member of the beneficiaries of the trust, may be deemed to indirectly beneficially own the securities owned by the trust.

The shares were purchased in multiple transactions at prices ranging from $13.9079 to $14.245, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by a trust, for the benefit of the reporting person's immediate family. Mark P. Lappe, as an immediate family member of the beneficiaries of the trust, may be deemed to indirectly beneficially own the securities owned by the trust.

The shares were purchased in multiple transactions at prices ranging from $13.925 to $14.04, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

These securities are directly owned by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012. Kimberly Manhard is a trustee of the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012 and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Kimberly Joan Manhard Revocable Trust, Dtd 6/4/2012.

The shares were purchased in multiple transactions at prices ranging from $13.48 to $14.25, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The reporting person is a trustee of the Forsyth Family Trust Dated July 20, 2001 and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Forsyth Family Trust Dated July 20, 2001.

The shares were purchased in multiple transactions at prices ranging from $12.80 to $13.00, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The reporting person is a trustee of the Forsyth Family Trust Dated July 20, 2001 and, in such capacity, may be deemed to indirectly beneficially own the securities owned by the Forsyth Family Trust Dated July 20, 2001.

The shares were purchased in multiple transactions at prices ranging from $12.82 to $13.10, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The shares were purchased in multiple transactions at prices ranging from $12.77 to $13.14, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

This transaction involved a gift of 10,000 shares of Common Stock by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child A. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

This transaction involved a gift of 89,050 shares of Common Stock by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to the reporting person's children, relatives, and other individuals. Of the shares gifted, 40,000 shares were gifted to the reporting person's adult children not residing in the reporting person's household, 22,825 shares were gifted to trusts for the benefit of individuals not residing in the reporting person's household, 4,150 shares were gifted to relatives not residing in the reporting person's household, and 2,075 shares were gifted to a UTMA for the benefit of a minor not residing in the reporting person's household, in each case to which the reporting person does not have a beneficial interest.

These securities are directly owned by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust. Jon Faiz Kayyem is the trustee of The Jon Faiz Kayyem and Paige N. Gates Family Trust and he disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

This transaction involved a gift of 10,000 shares of Common Stock by The Jon F. Kayyem and Paige Gates-Kayyem Family Trust to a custodial account managed by the reporting person for the benefit of the reporting person's minor child, Child B. The reporting person disclaims beneficial ownership of these securities, except to the extent of any indirect pecuniary interest in his distributive shares therein.

The shares were purchased in multiple transactions at prices ranging from $16.81 to $17.805, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The shares were purchased in multiple transactions at prices ranging from $17.81 to $18.10, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The shares were purchased in multiple transactions at prices ranging from $17.01 to $18.00, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The shares were purchased in multiple transactions at prices ranging from $18.01 to $18.50, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The shares were purchased in multiple transactions at prices ranging from $17.40 to $18.10, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

The shares were purchased in multiple transactions at prices ranging from $16.25 to $16.75, inclusive. The reported price reflects the weighted-average purchase price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.